According to the discovery made in 1980's. RNA can act like enzyme to assemble new RNA molecules on RNA template. Which of the following statements is not proved by this theory?

Options

A. Coacervates may not have been the first step in the evolution of life .
B. Perhaps the first macromolecule was RNA.
C. Coacervates were the basis for the first cell.
D. After the formation of RNA, the stability of molecule imporved by surrounding RNA within a coacervate.

Answer

To determine which statement is not supported by the theory regarding RNA's role as an enzyme in assembling new RNA molecules on an RNA template, we can analyze the provided options based on the chemosynthetic theory. Here’s a step-by-step solution:

### Step-by-Step Solution:

1. **Understand the Theory**: The discovery from the 1980s indicates that RNA can function as an enzyme (ribozymes) and can replicate itself using an RNA template. This suggests that RNA could have been a key molecule in the early stages of life.

2. **Analyze the Options**: We need to evaluate each statement provided in the options to see which one is not supported by the theory.

3. **Option 1**: "Co-acervates may not have been the first step in the evolution of life."
- This is supported by the theory since the formation of aggregates (like lipids) is considered a precursor to cellular life, but not necessarily the first step.

4. **Option 2**: "Perhaps the first macromolecule was RNA."
- This is supported by the theory, as RNA is believed to have played a crucial role in early life forms.

5. **Option 3**: "Co-acervates were the basis of the first cell."
- This statement is incorrect according to the theory. The first cells are thought to have arisen from simpler molecules, and while co-acervates (aggregates of lipids) may have been involved, they were not the basis of the first cell.

6. **Option 4**: "After the formation of RNA, the stability of the molecules is improved by surrounding RNA with an aggregate."
- This statement is also supported by the theory, as surrounding RNA with aggregates could provide stability.

7. **Conclusion**: The statement that is not proved by the theory is Option 3: "Co-acervates were the basis of the first cell."

### Final Answer:
The statement that is not proved by this theory is: **Option 3: "Co-acervates were the basis of the first cell."**